Ultra-thin, porous new materials easily "capture" carbon dioxide, which is a boon for slowing the greenhouse effect

It is reported that recently, Tianjin University School of Chemical Engineering Professor Wang Zhi team and his collaborators in the world for the first time to achieve a porous material film ultra-thin large-area preparation, can be more easily achieved carbon dioxide separation and capture, this research not only helps to reduce greenhouse gas emissions, but also for gas separation technology opened up a new field.
the afternoon of November 19, 2018, professor Wang Zhi of Tianjin University's School of Chemical Engineering and his collaborators published an online article entitled "Metal-induced ordered microporous polymers for fabricating large" -area gas separation membranes" academic papers (DOI:10.1038/s41563-018-0221-3), the first large-area preparation of ultra-thin porous membranes.
paper for the first time found that metal-induced methods can be used to synthesize ordered micro-porous membranes for efficient CO2/N2 separation
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. In this paper, the author successfully constructed a metal-induced ordered micropore polymer (MMPs) with an ordered micropore structure using metal ions (Cu2 plus, Zn2 plus), organic conceded molecules and short-chain polymers as structural units. MMPs can be applied to commercial films with good mechanical stability. And because CO2 and the polymer unit in it have better affinity, it can pass through the film, while the less affinity nitrogen is blocked, thus achieving gas separation. From Texas Agricultural University, Prof. Freeman commented in the same journal that the work opens up a whole new field of gas separation technology.
, the separation and capture of carbon dioxide is of great significance for mitigating greenhouse gas emissions in industrial production. However, in the carbon capture, the current gas separation in the "MOFs" material effect is not ideal.
MOFs are short for Metal Organic Framework compounds. A type of crystalline porous material with periodic network structure is formed by connecting the inorganic metal center (metal ion or metal cluster) with the bridge-connected organic ligand by self-assembly. MOFs is an organic-inorganic hybrid material, also known as a matching polymer, which differs from both inorganic porous materials and general organic compounds. It combines the rigidity of inorganic materials with the flexible characteristics of organic materials. It shows great potential and attractive development prospect in the research of modern materials. MOFs have many applications in the field of chemical and chemical industry, such as gas storage, molecular separation, catalysis, drug release and so on, because of its porous, large ratio surface area and polymetallic bits.
(1) gas adsorption and storage
: MOFs special hole structure, is the ideal hydrogen storage material, now MOF177 hydrogen storage capacity at 77K has reached 7.5%, the current research focus is on achieving a breakthrough in high hydrogen storage capacity at room temperature;
(3) Catalysis: the unsaturated metal bits of MOFs material, as Lewis acid levels, can be used as catalytic centers, and are now used for cyanide-based reactions, oxidation reactions of hydrocarbons and alcohols, esterification reactions, Diels-Alder reactions and other reactions, with high activity;
(4) Drug slow release: MOFs material has a high load, biological compatibility and functional diversity, can be widely used in drug vectors, such as MIL-100 and MIL-101 ibuprofen has better drug carrying and release effect The solid load rate and slow release time were 350 mg/g, 3 days, 1400 mg/g, and 6 days, respectively. Looking to the future MOFs materials in terms of variety, performance, synthesis methods, applications, as a new type of materials, will be further developed and expanded.
, especially in the power industry, emissions often contain large amounts of water vapor. However, the structure of the "MOFs" material is easily damaged in wet conditions. Moreover, in the process of preparing the separation filter film, the "MOFs" material needs to be mixed with another polymer and coated to the polymer substrate to form a "mixed phase" film. However, since there is no chemical bridding between "MOFs" and polymers in the film, the actual filter film can have defects such as cracks and unevenness, which can affect the performance of the actual use.
, Professor Wang Zhi's team has successfully constructed for the first time a metal-induced ordered micropore polymer (MMPs) with an ordered micropore structure for the efficient separation of carbon dioxide and nitrogen. The structure is based on copper or zinc metal ions, organic coupled molecules and short-chain polymers as structural units. "MMPs" can be coated on the commodity substyl film, not only has the characteristics of "MOFs" hole structure, but also overcomes its shortcomings, and has better film-forming, better stability. At the same time, the structure can make the polymer unit with better affinity through carbon dioxide, and the less affinity nitrogen is blocked, thus achieving gas separation.
Wang Zhi's team has long been committed to the study of CO2 separation membrane technology. In order to break through the performance bottleneck of CO2 separation film, high-performance membrane materials are designed and prepared from the aspects of comprehensive control membrane structure, joint multi-selection mechanism, construction of CO2 high-speed transmission channel and construction of high imitation structure. Successfully developed a variety of new CO2 separation membrane materials with world-leading or even leading separation properties, the results of which were published in high-level journals such as Nature Materials, Angewandte Chemie International Edition, Advanced Materials, AIChE Journal, Energy and Environmental Science. On this basis, the system developed the membrane material, membrane and membrane components of the large-scale preparation technology. Co2 separation film-related research has been supported by national key research and development plans, 863 plans, 973 plans, national natural science foundation key projects and other projects.